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flag of Dominican Republic

The Dominican revolutionary group known as
La Trinitaria emphasized its Christian heritage by placing a white cross on the background of the blue-red flag. The revolution led by
La Trinitaria broke out on February 27, 1844, and the flag, designed by Juan Pablo Duarte, was hoisted the next day. The success of the independence movement led to a constitution for the country, which established the...

organization by Duarte

...his education (1828–33), became determined to free the eastern part of Hispaniola from Haitian domination. On his return to the island he and several other patriots organized a secret society,
La Trinitaria, to work toward independence and to stimulate liberalism. His first attempt to oust the Haitians in 1843 collapsed, and he fled the country; but his followers succeeded in overthrowing...